Nutrient recovery from manure digestate by using waste magnesite powder and bone meal as sustainable substitutes for struvite precipitation

Kutlar F. E., Engin I., Yilmazel Y. D.

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, cilt.99, sa.7, ss.1671-1682, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 99 Sayı: 7
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1002/jctb.7661
  • Dergi Adı: JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, Food Science & Technology Abstracts, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1671-1682
  • Anahtar Kelimeler: bone meal, nutrient recovery, optimization, struvite, waste magnesite powder
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

BACKGROUND: Struvite (MgNH4PO4.6H(2)O) precipitation is a sustainable approach that can offer simultaneous removal/recovery of nutrients from biogas plant effluents. However, most biogas plant effluents contain a higher molar concentration of nitrogen (N) than magnesium (Mg) and phosphorus (P). Therefore, the external addition of Mg2+ and phosphate (PO43-) salts is needed to maximize the recovery. In this study, Mg-rich waste magnesite powder and P-rich bone meal were used as sustainable additives. The Box-Behnken design was applied to determine optimum conditions of process parameters (pH, Mg:N and P:N molar ratios) to maximize ammonium-nitrogen (NH4-N), PO4-P and Mg(2+)recoveries. RESULTS: NH4-N, PO4-P and Mg2+ recoveries were in the ranges 78.5%-96.9%, 69.2%-96.3% and 75.1%-99.9%, respectively. The actual and predicted values showed significant consistency, indicating that the model is satisfactory. Under optimum conditions (pH = 9.0, Mg:N = 2.2, P:N = 1.8), 97.8 +/- 0.1% NH4-N, 96.6 +/- 0.31% PO4-P and 84.4 +/- 0.9% Mg2+ recovery were attained. The X-ray diffraction results confirmed the sole presence of struvite crystals. Scanning electron microscopy images showed irregular prismatic orthorhombic crystals and amorphous material depositions on precipitates of similar to 25 mu m crystal size. The product was 49% struvite with 15.2% P content. The heavy metal content was lower than regulatory limits. CONCLUSION: Even though waste material and industrial by-products have been used as additives in this process, high NH4-N and PO4-P recoveries were recorded under optimum conditions. These results are promising and illustrate a powerful example of industrial symbiosis, and the precipitate containing struvite can serve as a valuable product. (c) 2024 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).